I recommend doing a channel rescan for new digital channels from time to time because new digital channels can be added at any time with No notice. Also can contact WTHI at
http://www.wthitv.com/generic/About_Us/contact_wthitv , Talk with some one higher up at WHTI or talk with engineering department because the engineering departments at the tv stations are the ones that set up the transmitters to transmit new channels. Fox is not likely to just drop off the map , Fox will most likely move to one of the Tv stations close by.